From ef399a3033aa860ea1653b9c4306c0e78777e981 Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Tue, 29 May 2007 11:24:45 +0000 Subject: Add --random option to DNAT and REDIRECT targets and fix the manpage mess this option left behind. --- extensions/libipt_SNAT.man | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-) (limited to 'extensions/libipt_SNAT.man') diff --git a/extensions/libipt_SNAT.man b/extensions/libipt_SNAT.man index daef78f1..7b34799a 100644 --- a/extensions/libipt_SNAT.man +++ b/extensions/libipt_SNAT.man @@ -7,7 +7,7 @@ modified (and all future packets in this connection will also be mangled), and rules should cease being examined. It takes one type of option: .TP -.BR "--to-source " "\fIipaddr\fP[-\fIipaddr\fP][:\fIport\fP-\fIport\fP]" [ "--random" ] +.BR "--to-source " "\fIipaddr\fP[-\fIipaddr\fP][:\fIport\fP-\fIport\fP]" which can specify a single new source IP address, an inclusive range of IP addresses, and optionally, a port range (which is only valid if the rule also specifies @@ -17,15 +17,18 @@ or If no port range is specified, then source ports below 512 will be mapped to other ports below 512: those between 512 and 1023 inclusive will be mapped to ports below 1024, and other ports will be mapped to -1024 or above. Where possible, no port alteration will If option -.B "--random" -is used then port mapping will be forcely randomized to avoid -attacks based on port prediction (kernel >= 2.6.21). -.RS -.PP +1024 or above. Where possible, no port alteration will + In Kernels up to 2.6.10, you can add several --to-source options. For those kernels, if you specify more than one source address, either via an address range or multiple --to-source options, a simple round-robin (one after another in cycle) takes place between these addresses. Later Kernels (>= 2.6.11-rc1) don't have the ability to NAT to multiple ranges anymore. +.TP +.BR "--random" +If option +.B "--random" +is used then port mapping will be randomized (kernel >= 2.6.21). +.RS +.PP -- cgit v1.2.3